Im a electrician, and work in domistic installation.
I've been ofered the job of rewiring a office building on a power station, when i've looked at the old installation the old lighting circuit has been partly removed and seams to have been wired as a lighting ring circuit with 2.5mm twin. Is this the normal wiring practice with industrial installations.
Although one could use a lighting ring really no point as all lights tend to be used together and rings are quite rare in industrial premises the use of sub-boards really removes the requirement. Because of the price of CatII fitting in any other form than the square type that replace ceiling tiles the use of lighting plugs and sockets is very common so complete units can be replaced without turning off the lights. Singles and conduit also common as multi-circuits can all be fed in same conduit with maybe four blocks of light in a single room often you will see lights on at the back of an office but off near the windows. Glare on computer screens is a problem. On sockets RCBO's are very common so as to reduce the chance of build up of leakage from many computers. Even seen UPS's at every PC not in case they trip but to stop them tripping as the leakage from each switch mode power supply builds up. The client is more concerned with no loss of production than cost of RCBO's and far more likely to pay for stuff than domestic with HF lighting becoming very much the norm where in domestic very rare. Do remember lighting restrictions in rooms where computers are used.
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